The calculation of cubic capacity is the multiplying of the length, width and height of any given article. The articles below are marked with length, width, height and diameter, which is used in the cubic measurement calculation of cylindrical objects such as drums. In the case of drums, you measure the length and multiply it by the diameter twice. For other items you measure the three dimensions as above and multiply them together. For instance, if the drum had a diameter of 0.5 m and a length of 1 m, and the tool box a length of 0.35 m, width of 0.2 , and a height of 0.19 m, the following calculations would apply. Consignments charged on actual weight or cubic weight, whichever the greater.